WO2022134930A1

WO2022134930A1 - Fan assembly and dust collector

Info

Publication number: WO2022134930A1
Application number: PCT/CN2021/130438
Authority: WO
Inventors: 曾振杰; 胡小文; 秦杰; 张龙新
Original assignee: 广东美的白色家电技术创新中心有限公司; 美的集团股份有限公司
Priority date: 2020-12-25
Filing date: 2021-11-12
Publication date: 2022-06-30
Also published as: CN114688046B; CN114688046A

Abstract

The present application provides a fan assembly and a dust collector. The fan assembly comprises: a rotating shaft; a fixing base, the rotating shaft being disposed in the fixing base, and along the axial direction of the rotating shaft, the fixing base comprising a mounting cavity and a diffusion channel which are communicated; a first impeller connected to the rotating shaft, at least a part of the first impeller being disposed in the mounting cavity; and a second impeller connected to the rotating shaft, the second impeller being disposed in the mounting cavity, and along the axial direction of the rotating shaft, the second impeller being located between the first impeller and the diffusion channel. According to the fan assembly provided by the present application, the rotating shaft, the first impeller, and the second impeller are all disposed in the fixing base, so that the fixing base can not only carry the rotating shaft, the first impeller, and the second impeller to achieve the effects of fixing, support, and appearance decoration, but also can achieve the effect of diffusion by means of the diffusion channel. That is, the functions of the fixing base are diversified, and thus the miniaturization and compactness of the structure are achieved.

Description

Fan Assembly and Vacuum Cleaner

This application claims the priority of the Chinese patent application with the application number "2020115588878" and the invention title "Fan Assembly and Vacuum Cleaner" filed with the China Patent Office on December 25, 2020, the entire contents of which are incorporated into this application by reference.

technical field

The present application relates to the technical field of household appliances, and in particular, to a fan assembly and a vacuum cleaner.

Background technique

At present, with the improvement of people's quality of life, vacuum cleaners are gradually favored by consumers due to their advantages of small size, light weight and convenient use. In order to improve the suction power of the vacuum cleaner, at present, major manufacturers have increased the speed of the fan of the vacuum cleaner or increased the size of the fan, which is accompanied by an increase in the noise and volume of the vacuum cleaner, which is very unfavorable for users to use.

SUMMARY OF THE INVENTION

The present application aims to solve at least one of the technical problems existing in the prior art or related technologies.

To this end, a first aspect of the present application provides a fan assembly.

A second aspect of the present application also provides a vacuum cleaner.

In view of this, the first aspect of the present application proposes a fan assembly, comprising: a rotating shaft; a fixing seat, the rotating shaft is arranged in the fixing seat, and along the axial direction of the rotating shaft, the fixing seat includes a connected installation cavity and a diffusion channel; An impeller is connected with the rotating shaft, at least a part of the first impeller is arranged in the installation cavity; the second impeller is connected with the rotating shaft, and the second impeller is arranged in the installation cavity, along the axial direction of the rotating shaft, the second impeller is located between the first impeller and the between the expansion channels.

The fan assembly provided by the present application includes a rotating shaft, a fixed seat, a first impeller and a second impeller. Among them, along the axial direction of the rotating shaft, a mounting cavity and a diffuser channel are arranged in the fixed seat, the rotating shaft is penetrated in the fixed seat, a first impeller and a second impeller are arranged on the rotating shaft in sequence, and the second impeller is located between the first impeller and the expanding channel. Between the pressure channels, that is, the rotating shaft, the first impeller and the second impeller are all arranged in the fixed seat, so that the fixed seat can not only carry the rotating shaft, the first impeller and the second impeller, and play the role of fixed support and appearance decoration, and also The function of diffusing can be achieved through the diffusing channel, that is, the functions of the fixing seat are diversified, thereby realizing the miniaturization and compactness of the structure.

According to the above-mentioned fan assembly provided by the present application, it may also have the following additional technical features:

In the above technical solution, further, the fixing seat further includes: a first fixing ring; a second fixing ring, located in the first fixing ring, the second fixing ring and the first fixing ring enclose the diffusion channel and the installation cavity, and the rotating shaft connected with the second fixing ring; a plurality of first blades are connected with the inner wall surface of the first fixing ring and the outer wall surface of the second fixing ring, the plurality of first blades are distributed along the circumferential direction of the second fixing ring, and the adjacent first blades are A blade encloses an air outlet channel.

In any of the above technical solutions, further, the fan assembly further includes: at least one diffuser, along the radial direction of the rotating shaft, at least one diffuser is sleeved on the second fixed ring, located in the diffuser channel, at least one diffuser The compressor is located on the side of the first vane close to the second impeller, wherein, based on the number of the diffusers, the plurality of diffusers are connected in series along the axial direction of the rotating shaft.

In any of the above technical solutions, further, the diffuser includes: an outer ring; a plurality of second vanes connected to the inner wall of the outer ring, the plurality of second vanes are located between the outer ring and the second fixing ring, and Set around the reels.

In any of the above technical solutions, further, the diffuser further comprises: an inner ring, the inner ring is connected with the second vane, and the second vane is located between the outer ring and the inner ring.

In any of the above technical solutions, further, the fan assembly further includes: a recirculator, located in the installation cavity, between the first impeller and the second impeller; an air guide sleeve, located in the installation cavity, at least a A part and the second impeller are located in the air guide sleeve, part of the inner wall surface of the air guide sleeve and the return device form a return cavity, part of the inner wall surface of the air guide sleeve and the second impeller form a diffuser cavity, the diffuser cavity and the diffuser channel It communicates with the recirculation cavity, wherein along the flow direction of the airflow, the diameter of the recirculation cavity gradually decreases, and the diameter of the diffuser cavity gradually increases.

In any of the above technical solutions, further, the fan assembly further includes: a connecting piece, the connecting piece is sleeved on the rotating shaft, and along the axial direction of the rotating shaft, the two ends of the connecting piece are in contact with the ends of the first impeller and the second impeller respectively. Connection; locking piece, the locking piece is installed on the rotating shaft to fix the first impeller.

In any of the above technical solutions, further, the connecting piece includes a threaded sleeve, the rotating shaft is provided with a threaded structure, and the threaded sleeve is connected with the threaded structure to fix the second impeller.

In any of the above technical solutions, further, a part of the connecting piece is in contact with the recirculator, and the recirculator is smoothly connected with the second impeller through the connecting piece.

In any of the above technical solutions, further, the fan assembly further includes: a sealing ring, an accommodating groove is provided on the end face of the recirculator close to the first impeller, the accommodating groove is arranged around the rotating shaft, and the sealing ring is sleeved on the rotating shaft and located in the accommodating groove. in the slot.

In any of the above technical solutions, further, the sealing ring includes: a plurality of sealing sheets, the plurality of sealing sheets are arranged at intervals along the axial direction of the rotating shaft, and the outer annular surfaces of the plurality of sealing sheets are connected.

In any of the above technical solutions, further, along the axial direction of the rotating shaft, the distance between the sealing ring and the first blade is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

In any of the above technical solutions, further, the recirculation device includes: a recirculation disk, which is sleeved on the rotating shaft, and the recirculation cavity is enclosed by the recirculation disk and the inner wall of the air guide sleeve; guide vanes are arranged on the return disk, The guide vanes are connected with the return disk and the air guide sleeve.

In any of the above technical solutions, further, the fan assembly further includes: an air inlet cover, the air inlet cover is connected to the fixing seat, the air inlet cover includes an air inlet air duct, the air inlet air duct is communicated with the return cavity, and the first impeller is located in the In the air inlet duct, along the gas flow direction, the diameter of the air inlet air duct gradually increases.

In any of the above technical solutions, further, the air inlet cover is connected with the fixing seat by screw thread; or the air inlet cover and the fixing seat are in interference fit; or the air inlet cover and the fixing seat are clamped.

In any of the above technical solutions, further, based on the clamping connection between the air inlet cover and the fixing seat, one of the inner side wall of the fixing seat and the air inlet cover is provided with a clamping block, and the other is provided with a clamping slot, and the clamping block is connected with The card slot is snapped to fix the air inlet cover and the fixing seat.

In any of the above technical solutions, further, the first impeller and the second impeller are centrifugal impellers.

In any of the above technical solutions, further, the first impeller includes: a shaft part, the shaft part is connected with the rotating shaft, a part of the shaft part extends toward the second impeller and abuts against the second impeller; a plurality of blade parts, a plurality of blades The parts are arranged on the shaft part and distributed along the circumferential direction of the shaft part.

According to the second aspect of the present application, a vacuum cleaner is also proposed, comprising: the fan assembly as proposed in any of the above technical solutions.

Since the vacuum cleaner provided by the second aspect of the present application includes the fan assembly proposed by any of the above technical solutions, it has all the beneficial effects of the fan assembly.

Additional aspects and advantages of the present application will become apparent in the description section that follows, or will be learned by practice of the present application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

FIG. 1 shows a schematic structural diagram of a fan assembly according to an embodiment of the present application;

FIG. 2 shows a schematic diagram of an exploded structure of a fan assembly according to an embodiment of the present application;

Fig. 3 shows a partial structural schematic diagram of a fan assembly according to an embodiment of the present application;

FIG. 4 shows a schematic structural diagram of a recirculator according to an embodiment of the present application.

Wherein, the corresponding relationship between the reference numerals and the component names in Fig. 1 to Fig. 4 is:

1 Fan assembly, 10 shaft, 102 thread structure, 12 fixed seat, 120 installation cavity, 122 diffuser channel, 124 first fixing ring, 1242 clamping groove, 126 second fixing ring, 128 first blade, 14 first impeller, 140 Shaft, 142 Vane, 16 Second Impeller, 18 Diffuser, 182 Outer Ring, 184 Second Vane, 186 Inner Ring, 20 Recirculator, 202 Recirculation Disc, 204 Guide Vane, 206 Receiving Slot, 22 Air guide sleeve, 220 expansion chamber, 222 return chamber, 24 connecting piece, 26 locking piece, 28 sealing ring, 30 air inlet cover, 302 clamping block, 32 bearing, 34 coil assembly.

Detailed ways

In order to more clearly understand the above objects, features and advantages of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments may be combined with each other in the case of no conflict.

Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific details disclosed below. Example limitations.

The following describes the fan assembly 1 proposed according to some embodiments of the present application with reference to FIGS. 1 to 4 .

Example 1:

As shown in FIG. 1 and FIG. 2 , according to an embodiment of the first aspect of the present application, the present application proposes a fan assembly 1 , including: a rotating shaft 10 , a fixed seat 12 , a first impeller 14 and a second impeller 16 .

Specifically, the rotating shaft 10 is arranged in the fixed seat 12, and along the axial direction of the rotating shaft 10, the fixed seat 12 includes a connecting installation cavity 120 and a diffuser channel 122; the first impeller 14 is connected to the rotating shaft 10, and at least a part of the first impeller 14 The second impeller 16 is connected to the rotating shaft 10, and the second impeller 16 is arranged in the mounting cavity 120. Along the axial direction of the rotating shaft 10, the second impeller 16 is located between the first impeller 14 and the diffuser passage 122. .

The fan assembly 1 provided in the present application includes a rotating shaft 10 , a fixed seat 12 , a first impeller 14 and a second impeller 16 . Wherein, along the axial direction of the rotating shaft 10, the fixed seat 12 is provided with a mounting cavity 120 and a diffuser channel 122, the rotating shaft 10 is penetrated in the fixed seat 12, and the rotating shaft 10 is sequentially provided with a first impeller 14 and a second impeller 16, The second impeller 16 is located between the first impeller 14 and the diffuser passage 122 , that is, the rotating shaft 10 , the first impeller 14 and the second impeller 16 are all arranged in the fixed seat 12 , so that the fixed seat 12 can support both the rotating shaft 10 and the second impeller 16 . The first impeller 14 and the second impeller 16 play the role of fixed support and appearance decoration, and can also play the role of diffusing through the diffusing channel 122, that is, the functions of the fixed seat 12 are diversified, thereby realizing the fan assembly 1. The structure is miniaturized and compact.

Specifically, during the operation of the fan assembly 1 , the driving shaft 10 drives the first impeller 14 and the second impeller 16 to rotate, the first impeller 14 rotates to suck the external air into the fan assembly 1 , and drives the air to the second impeller 16 After the gas flows to the second impeller 16 , the gas further flows to the diffuser passage 122 under the driving of the second impeller 16 . In particular, through the cooperation of the first impeller 14 and the second impeller 16, two-stage driving of the gas is realized, on the one hand, the air supply capacity of the fan assembly 1 can be improved, and on the other hand, the working noise of the fan assembly 1 can be reduced.

Further, the second impeller 16 drives the gas into the diffusing channel 122 , so that the airflow flows out of the fan assembly 1 after being diffused by the diffusing channel 122 . In particular, due to the design of the diffusing channel 122, the radial dimensions of the first impeller 14 and the second impeller 16 can be greatly reduced while ensuring the air supply capacity of the fan assembly 1, thereby reducing the radial dimension of the fan assembly 1 itself. Small size and compact design of the fan assembly 1 are realized.

The fan assembly 1 proposed in the present application realizes the miniaturization and compactness of the fan assembly 1 through the setting of the fixed seat 12 . The working noise of the fan assembly 1 can be effectively reduced, and the radial dimension of the fan assembly 1 can be greatly reduced through the design of the diffuser channel 122. Under the condition that the fan assembly 1 can realize the secondary impeller air supply, the fan assembly can be ensured. The radial dimension of the assembly 1 will not increase, so that the radial dimension of the fan assembly 1 proposed in the present application is similar to the fan assembly 1 with a single impeller in the related art, and the flow efficiency of the gas is guaranteed to be improved.

Embodiment 2:

As shown in FIG. 1 and FIG. 2 , according to an embodiment of the present application, on the basis of the above-mentioned embodiment, the fixing base 12 further includes: a first fixing ring 124 , a second fixing ring 126 and a plurality of first fixing rings 124 . Blades 128 . The second fixing ring 126 is arranged in the first fixing ring 124, the second fixing ring 126 and the first fixing ring 124 enclose the diffuser channel 122 and the installation cavity 120, and the rotating shaft 10 is connected with the second fixing ring 126; The vanes 128 are connected to the inner wall surface of the first fixing ring 124 and the outer wall surface of the second fixing ring 126 , a plurality of first vanes 128 are distributed along the circumference of the second fixing ring 126 , and adjacent first vanes 128 enclose the outlet passage. .

In this embodiment, the mount 12 includes a first mount ring 124 , a second mount ring 126 and a plurality of first vanes 128 . The second fixing ring 126 is arranged in the first fixing ring 124 , and the plurality of first blades 128 are arranged between the first fixing ring 124 and the second fixing ring 126 . A vane 128 encloses the air outlet channel, so that the air flow can flow out of the fixing seat 12 through the air outlet channel, that is, the first vane 128 can also act as a support rib to connect the first fixing ring 124 and the second fixing ring 122 while playing the role of diffusing. The ring 126 improves the overall strength of the fixing seat 12 , and further improves the supporting strength of the fixing seat 12 for the rotating shaft 10 , the first impeller 14 and the second impeller 16 .

Further, as shown in FIG. 2 , the inner wall surface of the first fixing ring 124 and the outer wall surface of the second fixing ring 126 enclose the diffusion channel 122 , and the end of the second fixing ring 126 and the inner wall surface of the first fixing ring 124 The installation cavity 120 is enclosed, that is, the diffuser channel 122 and the installation cavity 120 are distributed along the axial direction of the rotating shaft 10, and the airflow can flow into the diffuser channel 122 under the driving of the first impeller 14 and the second impeller 16, and pass through the diffuser channel. 122 flows out of the fixed seat 12 through the air outlet channel after the expansion.

Further, the number of the plurality of first vanes 128 is greater than or equal to 10, and less than or equal to 35; by limiting the number of the first vanes 128, the requirements for both the diffusing effect and the preparation of the diffusing channel 122 are taken into consideration, wherein , when the number of the first vanes 128 is 10, the preparation process is the simplest, and when the number of the first vanes 128 is 35, the effect of the diffusion pressure reduction is the best.

Further, as shown in FIG. 1 , the fan assembly 1 further includes a coil assembly 34 and a bearing 32 . The coil assembly 34 and the bearing 32 are arranged in the second fixing ring 126 . The fixed connection between the rotating shaft 10 and the second fixing ring 126 is achieved.

Embodiment three:

As shown in FIGS. 1 and 2 , according to an embodiment of the present application, on the basis of the above-mentioned embodiment, the fan assembly 1 further includes: at least one diffuser 18 , along the radial direction of the rotating shaft 10 , at least one The diffuser 18 is sleeved on the second fixing ring 126 and located in the diffuser channel 122. At least one diffuser 18 is located on the side of the first vane 128 close to the second impeller 16, wherein, based on the number of the diffusers 18, A plurality of diffusers 18 are connected in series along the axial direction of the rotating shaft 10 .

In this embodiment, at least one diffuser 18 is disposed in the diffuser channel 122 , and the at least one diffuser 18 is sleeved on the second fixing ring 126 . Along the axial direction of the rotating shaft 10 , the diffuser 18 is located in the first Between the vanes 128 and the second impeller 16 . During the operation of the fan assembly 1 , the second impeller 16 drives the air to the diffuser 18 , so that the air is blown out from the air outlet channel after being diffused by the diffuser 18 . Due to the design of the diffuser 18 , the radial dimensions of the first impeller 14 and the second impeller 16 can be greatly reduced under the condition of ensuring the air supply capacity of the fan assembly 1 , thereby reducing the radial dimension of the fan assembly 1 itself, thereby realizing Structure miniaturization and compact design of the fan assembly 1 .

Further, if the number of diffusers 18 is multiple, the multiple diffusers 18 connected in series along the axial direction of the rotating shaft 10 together with the diffuser channels 122 on the fixed seat 12 realize multi-stage driving of the gas. On the one hand, the air supply capacity of the fan assembly 1 can be improved, and on the other hand, the working noise of the fan assembly 1 can be reduced.

Specifically, the number of the diffusers 18 is two, and the two diffusers 18 together with the first vanes 128 disposed in the diffusing channel 122 realize the three-stage diffusing function for the gas. That is, the first vane 128 disposed in the diffusing channel 122 realizes the third-stage diffusing function.

Of course, in order to better reduce the volume of the fan assembly 1 , the first-stage diffuser 18 may be appropriately reduced to further minimize the volume. That is to say, the diffuser 18 is not limited to three groups, and may be more or only one or two groups.

Further, as shown in FIG. 2 , the diffuser 18 includes: an outer ring 182 ; a plurality of second vanes 184 connected to the inner wall surface of the outer ring 182 , and the plurality of second vanes 184 are located between the outer ring 182 and the second fixing ring 126, and are arranged around the rotating shaft 10.

In this embodiment, the diffuser 18 includes an outer ring 182 and a plurality of second vanes 184 . The plurality of second vanes 184 are disposed between the outer ring 182 and the second fixed ring 126 and are connected to the inner wall surface of the outer ring 182 , and is arranged around the rotating shaft 10, the adjacent second vanes 184 enclose the airflow channel of the diffuser 18, the second impeller 16 drives the gas into the diffuser 18, and the airflow enclosed by the adjacent second vanes 184 channel, so that the airflow flows into the air outlet channel after being diffused by the diffuser 18, and the air supply capacity of the fan assembly 1 is improved.

Further, as shown in FIG. 2 , the diffuser 18 further includes: an inner ring 186 , the inner ring 186 is connected with the second vane 184 , and the second vane 184 is located between the outer ring 182 and the inner ring 186 .

In this embodiment, the diffuser 18 can also be provided with an inner ring 186, and the second vanes 184 are arranged between the outer ring 182 and the inner ring 186, which improves the overall strength of the diffuser 18 and reduces noise during operation.

When the fan assembly 1 is working, driven by the first impeller 14 and the second impeller 16, the gas is driven into the diffuser 18, so that the air flows into the air outlet channel after being diffused by the diffuser 18, and the fan assembly is lifted. 1 air supply capacity.

Specifically, the second vane 184 connects the outer ring 182 and the inner ring 186 in a unitary structure.

It can be understood that the inner ring 186 is not necessary, and the inner ring 186 can also be eliminated, so that the first blade 128 is in close contact with the second fixing ring 126 of the fixing seat 12, and the same function can also be achieved.

Embodiment 4:

As shown in FIG. 1 and FIG. 2 , according to an embodiment of the present application, on the basis of the above-mentioned embodiment, the fan assembly 1 further includes: a return device 20 and an air guide sleeve 22 . The recirculator 20 is arranged in the installation cavity 120, between the first impeller 14 and the second impeller 16; the air guide sleeve 22 is arranged in the installation cavity 120, and at least a part of the recirculator 20 and the second impeller 16 are located in the air guide sleeve 22, part of the inner wall surface of the air guide sleeve 22 and the recirculator 20 enclose a return cavity 222, and part of the inner wall surface of the air guide sleeve 22 and the second impeller 16 enclose a diffuser cavity 220, the diffuser cavity 220 and the diffuser channel 122 It communicates with the recirculation cavity 222, wherein, along the flow direction of the airflow, the diameter of the recirculation cavity 222 gradually decreases, and the diameter of the diffuser cavity 220 gradually increases.

In this embodiment, the fan assembly 1 further includes a recirculator 20 and an air guide sleeve 22 , the recirculator 20 and the air guide sleeve 22 are both arranged in the installation cavity 120 , and the air guide sleeve 22 and the recirculator 20 enclose the recirculation cavity 222 , the air guide sleeve 22 and the second impeller 16 enclose the diffuser cavity 220 , so that during the operation of the fan assembly 1 , the air flow is driven by the first impeller 14 and first enters the recirculation cavity 222 , and then passes through the recirculation cavity 222 The guide flows into the diffuser chamber 220 .

The recirculator 20 is located between the first impeller 14 and the second impeller 16, and the recirculator 20 is used in cooperation with the first impeller 14, so that the gas flows from the first impeller 14 to the recirculator 20. Specifically, the recirculator 20 is sleeved on the rotating shaft 10, and plays the role of recirculation for the gas blown radially from the first impeller 14, thereby changing the flow direction of the gas blown radially from the first impeller 14, so that the part of the gas to the second impeller 16 .

In particular, along the flow direction of the gas, the diameter of the diffuser cavity 220 gradually increases, that is, when the gas flows in the diffuser cavity 220, the flow velocity of the gas decreases, and the pressure inside the diffuser cavity 220 increases, With this design, the radial dimension of the second impeller 16 can be effectively reduced under the condition of ensuring the same air supply volume, thereby realizing the compactness and miniaturization of the fan assembly 1 . Along the flow direction of the gas, the diameter of the recirculation cavity 222 is gradually reduced, that is, when the gas flows in the recirculation cavity 222, the flow velocity of the gas increases, which in turn enables the gas to enter the diffuser cavity 220 quickly. With the cooperation of 16, the gas diffusion is realized.

In the specific embodiment, the present embodiment adopts the diffuser cavity 220, the return cavity 222 and the diffuser channel 122 to work together, which can greatly reduce the radial dimension of the fan assembly 1, which is equivalent to the radial dimension of the fan assembly 1 of the single-stage vacuum cleaner. , and the aerodynamic efficiency is significantly improved compared with single-stage vacuum cleaners.

Embodiment 5:

As shown in FIG. 3 , according to an embodiment of the present application, on the basis of the above-mentioned embodiment, the fan assembly 1 further includes: a connecting member 24 and a locking member 26 . The connecting piece 24 is sleeved on the rotating shaft 10, and along the axial direction of the rotating shaft 10, the two ends of the connecting piece 24 are respectively abutted with the ends of the first impeller 14 and the second impeller 16; the locking piece 26 is installed on the rotating shaft 10 for fixing The first impeller 14 .

In this embodiment, the fan assembly 1 includes a connecting member 24 and a locking member 26. The connecting member 24 is sleeved on the rotating shaft 10, and along the axial direction of the rotating shaft 10, the two ends of the connecting member 24 are respectively connected with the first impeller 14 and the second impeller 10. The ends of the two impellers 16 abut, that is, along the axial direction of the rotating shaft 10 , the ends of the second impeller 16 , the connecting member 24 and the first impeller 14 are in close contact with each other, and are fixed by the locking member 26 , thereby The deformation problem caused by the overly long cantilever of the rotating shaft 10 is solved, and the strength of the rotating shaft 10 is improved.

Further, the end of the first impeller 14 , the end of the connecting piece 24 and the end of the second impeller 16 are flat, and the ends of the three abut and are locked by the locking piece 26 to realize the fixation of the three. .

In a specific application, the locking member 26 includes a locking nut, and the end of the rotating shaft 10 is provided with threads. Fixed position. Or the locking member 26 includes a screw, the rotating shaft 10 is provided with an internal thread, and the screw is connected with the internal thread on the rotating shaft 10 to fix the first impeller 14, or the locking member 26 includes a circlip, and the first impeller 14 is fixed by the circlip on the reel 10.

Further, the connecting member 24 includes a threaded sleeve, the rotating shaft 10 is provided with a threaded structure 102 , and the threaded sleeve is connected with the threaded structure 102 to fix the second impeller 16 .

In this embodiment, the connecting member 24 includes a threaded sleeve, the rotating shaft 10 is provided with a threaded structure 102, and the threaded sleeve is threadedly connected with the threaded structure 102 to fix the threaded sleeve on the rotating shaft 10, and at the same time limit the movement of the second impeller 16 The position of the second impeller 16 is fixed, so that the dynamic balance adjustment can be performed for the second impeller 16 .

In a specific application, as shown in FIG. 3 , the connecting member 24 is sleeved on the rotating shaft 10 and is located between the first impeller 14 and the second impeller 16 , and the recirculator 20 is sleeved on the rotating shaft 10 and located between the first impeller 14 and the second impeller 16 . Between the second impellers 16 , a part of the connecting member 24 passes through the shaft hole of the recirculator 20 and abuts with the first impeller 14 . The threaded structure 102 is disposed in the middle of the rotating shaft 10 , and after the threaded sleeve is connected to the threaded structure 102 , the second impeller 16 is fixed on the rotating shaft 10 , preventing the second impeller 16 from moving in the axial direction.

It can be understood that the connecting member 24 includes a threaded sleeve, that is, at least a part of the inner wall surface of the threaded sleeve is provided with an internal thread that can be connected with the threaded structure 102 .

Further, a part of the connecting piece 24 abuts against the recirculator 20 , and the recirculator 20 is smoothly connected with the second impeller 16 through the connecting piece 24 .

In this embodiment, as shown in FIG. 3 , the connecting member 24 and the recirculator 20 are both located between the first impeller 14 and the second impeller 16 , that is, the connecting member 24 is located between the diffuser chamber 220 and the return chamber 222 , It plays the role of connecting the diffuser cavity 220 and the return cavity 222 . A part of the connecting piece 24 passes through the recirculator 20 and abuts against the end of the first impeller 14 , a part of the connecting piece 24 abuts against the end of the recirculator 20 , and the connecting piece 24 contacts the surface of the recirculator 20 . , The surface of the second impeller 16 is smoothly connected, so that the recirculator 20 and the second impeller 16 transition smoothly, avoiding the connection between the connector 24 and the recirculator 20, and the connection between the connector 24 and the second impeller 16. Steps exist, thereby ensuring that This ensures that the air flow smoothly and smoothly flows from the recirculation cavity 222 to the diffuser cavity 220, reduces the flow resistance of the air flowing from the recirculation cavity 222 to the diffuser cavity 220, ensures the flow speed of the gas inside the fixed seat 12, and reduces the airflow in the fixed seat. Flow noise within 12.

Embodiment 6:

As shown in FIG. 3 , according to an embodiment of the present application, on the basis of the above-mentioned embodiment, the fan assembly 1 further includes: a sealing ring 28 , and an accommodating groove is provided on the end face of the recirculator 20 close to the first impeller 14 206 , the accommodating groove 206 is disposed around the rotating shaft 10 , and the sealing ring 28 is sleeved on the rotating shaft 10 and is located in the accommodating groove 206 .

In this embodiment, an accommodating groove 206 is provided on the end face of the recirculator 20 close to the first impeller 14 , and a sealing ring 28 is disposed in the accommodating groove 206 , that is, a sealing ring 28 is disposed between the recirculator 20 and the rotating first impeller 14 . The sealing ring 28 forms a sealing connection between the static sealing ring 28 and the dynamic first impeller 14, thereby reducing frictional noise caused by assembly errors. Further, the sealing ring 28 can be formed of a soft rubber material, so that the sealing ring 28 can be more easily assembled and fixed on the accommodating groove 206 , and the soft rubber material has strong sealing performance, which can effectively reduce the friction noise caused by the assembly error of the fan assembly 1 . .

Embodiment 7:

According to an embodiment of the present application, on the basis of the above-mentioned embodiment, the sealing ring 28 further includes: a plurality of sealing sheets, the plurality of sealing sheets are arranged at intervals along the axial direction of the rotating shaft 10, and the outer rings of the plurality of sealing sheets are 182 faces are connected.

In this embodiment, the sealing ring 28 includes a plurality of sealing sheets, and the plurality of sealing sheets are arranged at intervals along the axial direction of the rotating shaft 10 , so that the sealing ring 28 forms a multi-stage sealing structure, which improves the sealing effect.

Further, as shown in FIGS. 2 and 3 , the sealing ring 28 is provided with a groove, the accommodating groove 206 is provided with a protrusion, and the sealing ring 28 and the accommodating groove 206 are connected with the protrusion through the groove.

In this embodiment, the sealing ring 28 is provided with a groove, the accommodating groove 206 is provided with a protrusion, and the sealing ring 28 and the accommodating groove 206 are connected to each other through the groove and the protrusion, thereby facilitating the sealing of the sealing ring 28 disassembly.

Further, along the axial direction of the rotating shaft 10, the distance between the sealing ring 28 and the first vane 128 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

In this embodiment, along the axial direction of the rotating shaft 10, the distance between the sealing ring 28 and the first vane 128 is set to be greater than or equal to 0.1 mm and less than or equal to 0.5 mm. Within this range, the distance between the sealing ring 28 and the first blade 128 is set The clearance between the first blades 128 is reasonable. On the premise of reducing the sealing clearance as much as possible, reducing gas leakage, and further improving the fan assembly 1, it can also prevent the clearance between the sealing ring 28 and the first blade 128 from being too small. As a result, the requirement of machining accuracy is too high, which is beneficial to reduce the production cost while ensuring the performance of the fan assembly 1 .

Specifically, the distance between the sealing ring 28 and the first vane 128 is equal to 0.2 mm or 0.3 mm or 0.4 mm.

Embodiment 8:

As shown in FIG. 4 , according to an embodiment of the present application, on the basis of the above-mentioned embodiment, the return device 20 further includes: a return disk 202 , the return disk 202 is sleeved on the rotating shaft 10 , the return disk 202 and the air guide The inner wall of the sleeve 22 encloses the return cavity 222 ; the guide vanes 204 are arranged on the return plate 202 , and the guide vanes 204 are connected with the return plate 202 and the air guide sleeve 22 .

In this embodiment, the recirculator 20 includes a recirculation pan 202 and guide vanes 204 . The radial end surface of the return disk 202 is configured in an arc shape, so that the return disk 202 and the inner wall surface of the air guide sleeve 22 enclose the return cavity 222 and ensure that the return cavity 222 is communicated with the outlet end of the first impeller 14 , so that the gas driven by the first impeller 14 flows to the recirculator 20 . In addition, the guide vanes 204 are disposed on the return disk 202 , at least a part of which is located in the return cavity 222 . According to this design, during the operation of the fan assembly 1, the gas enters the return chamber 222 under the driving of the first impeller 14, and flows to the second impeller 16 under the guiding action of the guide vanes 204, so as to make the return flow The rectifier 20 has a good rectification effect.

Specifically, as shown in FIG. 4 , a plurality of guide vanes 204 are provided and extend spirally along the outer circumference of the return disk 202 .

Specifically, during the operation of the fan, the first impeller 14 and the second impeller 16 are centrifugal impellers. Since the first impeller 14 is axially in and radially out, the gas blown out from the first impeller 14 is directed toward the air guide sleeve 22 Through the design of the recirculator 20 , especially the guide action of the guide vanes 204 , the flow direction of the airflow blown out from the first impeller 14 is changed, so that this part of the airflow flows toward the second impeller 16 .

Further, the guide vanes 204 are connected with the inner wall of the air guide hood by ultrasonic welding, so that the guide vanes 204 define a streamlined return cavity 222, which also acts as a force rib to connect the return disk 202 and the air guide sleeve 22. This design reduces the use of parts and improves assembly efficiency.

Embodiment 9:

As shown in FIG. 1 and FIG. 2, according to an embodiment of the present application, on the basis of the above-mentioned embodiment, the fan assembly 1 further includes: an air inlet cover 30, which is connected to the fixing seat 12, The air cover 30 includes an air inlet duct, which is communicated with the return cavity 222. The first impeller 14 is located in the air inlet duct, and the diameter of the air inlet duct gradually increases along the gas flow direction.

In this embodiment, the fan assembly 1 further includes an air inlet cover 30, the air inlet cover 30 is connected to the fixing base 12, the air inlet cover 30 includes an air inlet air duct, and the air inlet air duct communicates with the return cavity 222. During the operation of the fan assembly 1, the air flow, driven by the first impeller 14, first enters the air inlet air duct of the air inlet cover 30, and then enters the return cavity 222 of the air guide sleeve 22 through the air inlet air duct, and goes toward the second air inlet duct. The impeller 16 flows.

In particular, along the gas flow direction, the diameter of the near-air duct gradually increases. That is, when the gas flows in the air inlet duct, the flow velocity of the gas decreases, and the air pressure inside the air inlet duct increases. With this design, the radial dimension of the first impeller 14 can be effectively reduced under the condition of ensuring the same air supply volume, thereby realizing the compactness and miniaturization of the fan assembly 1 .

Further, the end of the air inlet cover 30 abuts against the end of the air guide sleeve 22 , that is, along the axial direction of the rotating shaft 10 , the diffuser air duct, the air guide sleeve 22 and the air inlet cover 30 are sequentially connected in series.

Embodiment ten:

According to an embodiment of the present application, on the basis of the above-mentioned embodiment, further: the air inlet cover 30 is screwed to the fixing seat 12; or the air inlet cover 30 is in an interference fit with the fixing seat 12; The seat 12 is snapped.

In this embodiment, the air inlet cover 30 and the fixing seat 12 can be connected by screw threads, and the air inlet cover 30 and the fixing seat 12 can be quickly installed and easily disassembled through screw fitting; or the air inlet cover 30 and the fixing seat 12 In this way, the use of parts is reduced and the assembly efficiency is improved; or the air inlet cover 30 is clamped with the fixing seat 12, which facilitates the disassembly of the air inlet cover 30 and the fixing seat 12, and improves the assembly efficiency.

Further, as shown in FIGS. 1 and 2 , based on the engagement of the air inlet cover 30 with the fixing seat 12 , one of the inner side wall of the fixing seat 12 and the air inlet cover 30 is provided with a clamping block 302 , and the other is provided with a clamping block 302 . The clamping slot 1242 , the clamping block 302 and the clamping slot 1242 are clamped to fix the air inlet cover 30 and the fixing base 12 .

In this embodiment, when the air inlet cover 30 is connected to the fixed seat 12 by snap connection, the inner side of the fixed seat 12 and the air inlet cover 30 are respectively provided with a locking block 302 and a locking groove 1242 that cooperate with each other, so as to realize the The connection between the air inlet cover 30 and the fixing seat 12 is fixed, which ensures the stability of the fan assembly 1 .

In a specific application, as shown in FIG. 2 , the first fixing ring 124 of the fixing seat 12 is provided with a clamping groove 1242, and the air inlet cover 30 is provided with a clamping block 302. During installation, the diffuser 18, the second After the impeller 16 , the air guide sleeve 22 , the recirculator 20 , the first impeller 14 , etc. are all installed in the fixing seat 12 , the air inlet cover 30 is fixed on the fixing seat 12 through the connection between the clamping block 302 and the clamping groove 1242 .

Further, the air inlet cover 30 is smoothly connected with the end of the air guide sleeve 22 .

Embodiment eleven:

According to an embodiment of the present application, on the basis of the above-mentioned embodiment, further: the first impeller 14 and the second impeller 16 are both centrifugal impellers.

In this embodiment, the first impeller 14 and the second impeller 16 are both centrifugal impellers, which improves the air output of the fan assembly 1 .

In a specific application, the axial direction of the first impeller 14 and the second impeller 16 is set as the air inlet, and the radial direction of the first impeller 14 and the second impeller 16 is used as the air outlet. Specifically, the first impeller 14 discharges air in the radial direction, while the second impeller 16 is located in the axial direction of the first impeller 14 . The backflow chamber 222 , such as the diffuser chamber 220 , is guided by the backflow chamber 222 , and then flows into the diffuser passage 122 through the driving of the second impeller 16 and then flows out of the fixing seat 12 after being pressurized.

Embodiment 12:

As shown in FIG. 2, according to an embodiment of the present application, on the basis of the above-mentioned embodiment, the first impeller 14 further includes: a shaft portion 140, the shaft portion 140 is connected with the rotating shaft 10, and a part of the shaft portion 140 is directed toward the first impeller 140. The second impeller 16 extends and abuts against the second impeller 16 ; a plurality of blade portions 142 are provided on the shaft portion 140 and are distributed along the circumferential direction of the shaft portion 140 .

In this embodiment, the first impeller 14 includes a shaft portion 140 and a plurality of blade portions 142 disposed on the peripheral side of the shaft portion 140 . The rotation of the shaft portion 140 drives the movement of the blade portions 142 , which in turn drives the airflow movement, so as to realize the inlet and outlet of the fan assembly 1 . Wind, wherein a part of the shaft portion 140 extends toward the second impeller 16 and abuts against the second impeller 16, that is, along the axial direction of the rotating shaft 10, the second impeller 16 and the end of the first impeller 14 abut, thereby reducing The length of the cantilever shaft is reduced, thereby solving the deformation problem caused by the excessively long cantilever of the rotating shaft 10 and improving the strength of the rotating shaft 10 .

Specifically, a portion of the shaft portion 140 of the first impeller 14 extends from the second impeller 16 and abuts against the shaft end of the second impeller 16 .

Embodiment thirteen:

According to the second aspect of the present application, a vacuum cleaner is also proposed, comprising: the fan assembly 1 as proposed in any of the above embodiments.

Since the vacuum cleaner provided in the second aspect of the present application includes the fan assembly 1 proposed in any of the above embodiments, it has all the beneficial effects of the fan assembly 1 .

Embodiment fourteen:

According to a specific embodiment of the present application, as shown in FIGS. 1 and 2 , the fan assembly 1 includes: an air inlet cover 30 , an air guide sleeve 22 , a fixed seat 12 , a diffuser 18 , a coil assembly 34 , a bearing 32 , The rotating shaft 10, the second impeller 16, the threaded sleeve, the return device 20, the sealing ring 28, the first impeller 14, and the locking nut are composed.

When the fan works, the air flows through the rotating first impeller 14, the recirculator 20, the threaded guide sleeve, the second impeller 16, the diffuser 18, and flows out from the diffuser passage 122 of the fixed seat 12 to complete the gas pressurization.

Specifically, as shown in FIG. 2 , the fixing base 12 is composed of three parts, namely a first fixing ring 124 , a second fixing ring 126 , and a first blade 128 (the number of the first blade 128 is more than 10). Wherein, the first fixing ring 124 and the second fixing ring 126 are integrated by the first vane 128 in the middle, and the air outlet channel is between the adjacent first vanes 128. At the same time, the first vane 128 is connected to the first fixed The ring 124 and the second fixing ring 126, so the first blade 128 also constitutes a connecting support rib connecting the first fixing ring 124 and the second fixing ring 126, which reduces the use of parts and improves the miniaturization of the fan assembly 1. . The coil assembly 34 and the bearing 32 are both fixed in the second fixing ring 126 , and the rotating shaft 10 is also fixed in the second fixing ring 126 by interference fit with the bearing 32 . That is, the first vane 128 of the fixed seat 12 has the functions of the diffuser 18, the fixing and the external appearance, and realizes the reduction of small parts and the multi-functionality. At the same time, the first blade 128 is connected to the first fixing base 12 and the second fixing base 12 , which plays a role of force support, and also reduces the use of connecting parts.

The fixed seat 12 is provided with a diffuser channel 122, and a plurality of diffusers 18 are connected in series and fixed in the diffuser channel 122. When the fan assembly 1 is in operation, the series-connected diffusers 18 and the first diffuser on the fixed seat 12 The blades 128 together realize the function of the three-stage diffuser 18 , which improves the supercharging effect of the fan assembly 1 .

The plurality of diffusers 18 , the air guide sleeves 22 and the air inlet cover 30 are respectively fixed in series in the first fixing ring 124 of the fixing seat 12 , the air inlet cover 30 is provided with a clamping block 302 , and the first fixing ring 124 A clamping slot 1242 is provided on the inner wall surface, and the clamping block 302 cooperates with the clamping slot 1242 to realize the series fastening of the fixed seat 12 , the diffuser 18 , the air guide sleeve 22 and the air inlet cover 30 .

The diffuser 18 is composed of a second vane 184, an outer ring 182, and an inner ring 186. The number of the second vanes 184 is more than 10. The adjacent second vanes 184 are air passages, and the second vanes 184 It is also a force-bearing support rib connecting the outer ring 182 and the inner ring 186 . Therefore, this connection method reduces the use of parts and improves the miniaturization of the fan assembly 1 .

Wherein, the fan assembly 1 in this embodiment includes two series-connected diffusers 18 and a first-stage diffuser 18 composed of first blades 128 , and the three constitute a three-stage diffuser 18 . The volume of the small fan assembly 1 can be appropriately reduced by the first-stage diffuser 18 to minimize the volume. That is to say, the diffuser 18 is not limited to three groups, and may be more or only one or two groups.

Wherein, as shown in FIG. 4 , the recirculator 20 includes: a recirculation disc 202 and guide vanes 204 . A set of guide vanes 204 are arranged on the surface of the return disc 202 . , to achieve the fixation between the recirculator 20 and the air guide sleeve 22 . After the air is accelerated and pressurized by the first impeller 14 , the air is guided through the guide vanes 204 , and then goes to the second impeller 16 for further pressurization.

3, the second impeller 16, the threaded sleeve, the first impeller 14 and the lock nut are respectively fixed in series in the axial direction of the rotating shaft 10, wherein the second impeller 16, the threaded sleeve, the first impeller 14 The end faces of the shafts are flat and close to each other, and are then pressed and locked by the lock nut, which can reduce the deformation problem of the shaft 10 when the shaft 10 rotates at high speed due to the overlong cantilever of the shaft 10, and improve the strength of the shaft 10.

Of course, the fixing of the second impeller 16 does not necessarily require the use of a threaded sleeve. The first impeller 14 can be partially extended and pressed against the second impeller 16. The assembly scheme can also reduce the problem of excessively long shaft cantilevers. For the fixing of the secondary impeller, the rotating shaft 10 can also be fixed with internal threads and then fixed with screws, or fixed with a circlip.

Among them, a threaded structure 102 is provided in the middle of the rotating shaft 10, and its function is to adjust the dynamic balance of the second impeller 16 before assembling the first impeller 14. Perform dynamic balance calibration.

In addition, the threaded sleeves form the air duct surfaces of the return cavity 222 and the diffuser cavity 220 in a streamlined design, so that the threaded sleeves are connected to the front and rear of the second impeller 16 and the air duct surface of the recirculator 20. Smooth connection.

Among them, a sealing ring 28 is arranged between the recirculator 20 and the first impeller 14, which can reduce the backflow of the pressurized air. The inner side of the sealing ring 28 is provided with a plurality of thin and pointed sealing sheets. The static sealing ring 28 Only a small amount of clearance remains with the dynamic first impeller 14, and the clearance is greater than or equal to 0.1 mm and less than or equal to 0.5 mm. The sealing ring 28 is provided with a groove outside, which is tightly fitted and fixed with the return device 20 through the groove. Among them, the sealing ring 28 is formed of a soft rubber material, which makes it easy to be assembled and fixed on the recirculator 20, and the soft rubber material can also make it have a better sealing performance with the rotating first impeller 14, and can also effectively reduce the assembly error. friction noise.

Of course, the material of the sealing ring 28 is not limited to the soft rubber material.

It can be understood that the fixation between the air inlet cover 30 and the fixing seat 12 is not limited to the fixing method of the clamping groove 1242 and the clamping block 302, and the air inlet cover 30 and the fixing seat 12 can also be fixed by glue, or the whole circle of interference can be used. Matching fixing, or screw fixing, etc.

The fixing solution of the recirculator 20 and the air guide sleeve 22 is to pre-ultrasonic welding in advance, and the reflow blade is a streamlined air duct, and the reinforcement ribs are also welded to achieve fewer components and improve assembly efficiency.

In this application, the term "plurality" refers to two or more, unless expressly defined otherwise. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" may be a fixed connection, a detachable connection, or an integral connection; "connected" may be a Directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiment", etc. means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in this application at least one embodiment or example of . In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

A fan assembly, comprising:

shaft;

a fixed seat, the rotating shaft is arranged in the fixed seat, and along the axial direction of the rotating shaft, the fixed seat includes a connected installation cavity and a diffusion channel;

a first impeller, connected with the rotating shaft, and at least a part of the first impeller is arranged in the installation cavity;

The second impeller is connected to the rotating shaft. The second impeller is arranged in the installation cavity. Along the axial direction of the rotating shaft, the second impeller is located between the first impeller and the diffuser passage. .
The fan assembly of claim 1, wherein the mount further comprises:

the first fixing ring;

A second fixing ring is located inside the first fixing ring, the second fixing ring and the first fixing ring enclose the diffuser channel and the installation cavity, the rotating shaft and the second fixing ring connect;

A plurality of first vanes are connected with the inner wall surface of the first fixing ring and the outer wall surface of the second fixing ring, the plurality of first vanes are distributed along the circumferential direction of the second fixing ring, adjacent The first blade encloses the outlet passage.
The blower assembly of claim 2, further comprising:

At least one diffuser, along the radial direction of the rotating shaft, the at least one diffuser is sleeved on the second fixing ring and is located in the diffusing channel, and the at least one diffuser is located in the first a blade close to the side of the second impeller,

Wherein, based on the number of the diffusers being multiple, the multiple diffusers are connected in series along the axial direction of the rotating shaft.
The blower assembly of claim 3, wherein the diffuser comprises:

outer ring;

A plurality of second blades are connected to the inner wall surface of the outer ring, the plurality of second blades are located between the outer ring and the second fixed ring, and are arranged around the rotating shaft.
The blower assembly of claim 4, wherein the diffuser further comprises:

an inner ring, the inner ring is connected with the second vane, and the second vane is located between the outer ring and the inner ring.
The blower assembly of any one of claims 1 to 5, further comprising:

a recirculator, arranged in the installation cavity, between the first impeller and the second impeller;

An air guide sleeve is arranged in the installation cavity, at least a part of the return device and the second impeller are located in the air guide sleeve, and a part of the inner wall surface of the air guide sleeve and the return device are enclosed to form a return flow part of the inner wall surface of the air guide sleeve and the second impeller to form a diffuser cavity, the diffuser cavity is communicated with the diffuser channel and the return cavity, wherein, along the airflow direction, the The diameter of the return cavity gradually decreases, and the diameter of the diffuser cavity gradually increases.
The blower assembly of claim 6, further comprising:

a connecting piece, the connecting piece is sleeved on the rotating shaft, and along the axial direction of the rotating shaft, the two ends of the connecting piece are respectively abutted with the ends of the first impeller and the second impeller;

A locking piece is installed on the rotating shaft to fix the first impeller.
The blower assembly of claim 7, wherein:

The connecting piece includes a threaded sleeve, the rotating shaft is provided with a threaded structure, and the threaded sleeve is connected with the threaded structure to fix the second impeller.
The blower assembly of claim 7, wherein:

A part of the connecting piece is in contact with the recirculator, and the recirculator is smoothly connected with the second impeller through the connecting piece.
The blower assembly of claim 6, further comprising:

a sealing ring, an accommodating groove is provided on the end face of the recirculator close to the first impeller, the accommodating groove is arranged around the rotating shaft, and the sealing ring is sleeved on the rotating shaft and is located in the accommodating groove .
The fan assembly of claim 10, wherein the seal ring comprises:

A plurality of sealing sheets are arranged at intervals along the axial direction of the rotating shaft, and the outer annular surfaces of the plurality of sealing sheets are connected.
The blower assembly of claim 11, wherein:

The sealing ring is provided with a groove, the accommodating groove is provided with a protrusion, and the sealing ring and the accommodating groove are connected with the protrusion through the groove; and/or

In the axial direction of the rotating shaft, the distance between the sealing ring and the first vane is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.
The blower assembly of claim 6, wherein the recirculator comprises:

a return plate, the return plate is sleeved on the rotating shaft, and the inner wall surface of the return plate and the air guide sleeve encloses the return cavity;

The guide vane is arranged on the return plate, and the guide vane is connected with the return plate and the air guide sleeve.
The blower assembly of claim 6, further comprising:

an air inlet cover, the air inlet cover is connected with the fixing seat, the air inlet cover includes an air inlet air duct, the air inlet air duct is communicated with the return cavity, and the first impeller is located in the air inlet air duct. In the air duct, along the gas flow direction, the diameter of the air inlet air duct gradually increases.
The blower assembly of claim 14, wherein:

The air inlet cover is threadedly connected to the fixing seat; or

The air inlet cover is in an interference fit with the fixing seat; or

The air inlet cover is clamped with the fixing seat.
The blower assembly of claim 15, wherein:

Because the air inlet cover is clamped with the fixing seat, one of the inner side wall of the fixing seat and the air inlet cover is provided with a clamping block, and the other is provided with a clamping slot, and the clamping block is connected to the other. The card slot is clamped to fix the air inlet cover and the fixing seat.
A fan assembly according to any one of claims 1 to 5, wherein:

Both the first impeller and the second impeller are centrifugal impellers.
The fan assembly of any one of claims 1 to 5, wherein the first impeller comprises:

a shaft portion, the shaft portion is connected with the rotating shaft, and a part of the shaft portion extends toward the second impeller and abuts with the second impeller;

A plurality of blade portions are provided on the shaft portion and distributed along the circumferential direction of the shaft portion.
A vacuum cleaner comprising:

A fan assembly as claimed in any one of claims 1 to 18.